I am highly dubious about the real-world capabilities vs published specs of these WiFi repeaters.

The one I’m thinking of isn’t a wifi repeater - it’s a point-to-point beaming device which is hard-wired to my home router. Unless I buy the slightly cheaper Unifi AC-LR, which has a range of 183m, but is a completely configurable access point, where you can limit users downloads, or block sites, or even have a pay-key to access more data. Not only that, but you can configure a number of separate wifi networks, all with different passwords and characteristics, Allegedly!
but not having tried it, I’m not sure which option is best…
Don’t make me talk to a computer sales person, please!!!